Blue blob
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by Budgieye moderator
Blue blob looks like a Minkowski's Object. except very distant.
Forum: Saturday 30th April - Minkowski’s Object by Lightbulb500 and Stellar190 http://www.galaxyzooforum.org/index.php?topic=279140.msg544022#msg544022, relativistic jet hits hydrogen cloud and makes blue supergiant stars 6 million years ago.
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=137.7919024343333&dec=15.142962516404562
Has an active nucleus, as seeing Hα
Outside DECaLS
DECaLS g band, looks more like a star here.
So maybe just an overlapping star...
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Hi Budgieye, couple of things; it is outside DECaLS DR2 but inside DR3, your DECaLS images are PanSTARRS1 images, and your link is another SDSS object: http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?id=1237670448912008055 😃
Target galaxy is starforming with z=0.04931, has an SDSS FIRST (radio) reference without values (0) and is a 2MASX (infrared) source.
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=137.7919024343333&dec=15.142962516404562
Purple object is a GALEXASC UvS (ultraviolet) source, has SDSS FIRST reference but no values (0).
SDSS PhotoZ z=0.033953 zErr (6.391E-3) 0.006391 = very good error margin for PhotoZ, so good chance it is associated with target galaxy or in front of target galaxy.
Doesn't look like a star to me, it is a Source Type 'E' in DECaLS DR3 catalogue.
SDSS DR9
http://cas.sdss.org/dr9/en/tools/explore/obj.asp?ra=137.791401&dec=15.143707
DECaLS DR3
http://legacysurvey.org/viewer?ra=137.7913&dec=15.1440&zoom=16&layer=decals-dr3
So likely a very large starforming area? But might also be in front of target galaxy... More options Merger / starburst satellite galaxy / Minkowski's object-like / Voorwerp.
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